Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.21.2
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2021
Nov. 12, 2021
Document and Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2021  
Entity File Number 001-38835  
Entity Registrant Name DESKTOP METAL, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 83-2044042  
Entity Address, Address Line One 63 3rd Avenue  
Entity Address, City or Town Burlington  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 01803  
City Area Code 978  
Local Phone Number 224-1244  
Title of 12(b) Security Common Stock, $0.0001 Par Value per Share  
Trading Symbol DM  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   311,014,335
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001754820  
Amendment Flag false  
Entity Ex Transition Period false